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src/tests/tests2/32_led.c  view on Meta::CPAN

/* example from http://barnyard.syr.edu/quickies/led.c */

/* led.c: print out number as if on 7 line led display. I.e., write integer
   given on command line like this:  
      _   _       _  
   |  _|  _| |_| |_  
   | |_   _|   |  _| etc.

   We assume the terminal behaves like a classical teletype. So the top
   lines of all digits have to be printed first, then the middle lines of
   all digits, etc.

   By Terry R. McConnell

compile: cc -o led led.c

If you just want to link in the subroutine print_led that does all the
work, compile with -DNO_MAIN, and declare the following in any source file
that uses the call:

extern void print_led(unsigned long x, char *buf);

Bug: you cannot call repeatedly to print more than one number to a line.
That would require curses or some other terminal API that allows moving the
cursor to a previous line.

*/



#include <stdlib.h>
#include <stdio.h>

#define MAX_DIGITS 32
#define NO_MAIN


/* Print the top line of the digit d into buffer. 
   Does not null terminate buffer. */

void topline(int d, char *p){

   *p++ = ' ';
   switch(d){

      /* all these have _ on top line */

      case 0:
      case 2:
      case 3:
      case 5:
      case 7:
      case 8:
      case 9:
         *p++ = '_';
         break;
      default:
         *p++=' ';

   }
   *p++=' ';
}

/* Print the middle line of the digit d into the buffer. 
   Does not null terminate. */

void midline(int d, char *p){

   switch(d){

      /* those that have leading | on middle line */

      case 0:
      case 4:
      case 5:
      case 6:
      case 8:
      case 9:
         *p++='|';
         break;
      default:
         *p++=' ';	
   }
   switch(d){